There are two problems here.
When calendar doesn't crash, but just doesn't appear to sync, you've probably got a case of:
http://bugzilla.gnome.org/show_bug.cgi?id=316370
When the caledar crashes, that looks to me like something different. It
is possible that it is a regression introduced with the as-yet-
unofficial port of the evolution conduit code to the pilot-link 0.12.x
API. I don't know.
--
problems syncing calendar and todo list, adresses works
https://launchpad.net/bugs/19528